Search found 6839 matches

by hoglet
Wed Jan 24, 2018 10:27 pm
Forum: hardware
Topic: P.R.E.S. AP5 - Original and Re-Design
Replies: 258
Views: 17305

Re: P.R.E.S. AP5 - Original and Re-Design

One other (unrelated) AP5 question - I tried ListLife on the 6502 second processor. However, it doesn't seem to be happy. Sometimes it hangs at the menu screen, but if it gets past this the Life display is always blank except for some flickering at the top left. Is it just that ListLife is not comp...
by hoglet
Wed Jan 24, 2018 7:33 pm
Forum: hardware
Topic: Beeb FPGA
Replies: 486
Views: 29866

Re: Beeb FPGA -> My new (used) DE1

Connecting a USB keyboard via a PS/2 adapter does not seem to work (as per Hoglet's worry earlier in this thread), unlike the DE2 where it works fine. For now I'm assuming this is a limitation of the DE1. More likely the USB keyboard doesn't support PS/2 mode, or the PS/2 adapter is a mouse adapter...
by hoglet
Wed Jan 24, 2018 4:31 pm
Forum: hardware
Topic: SpectROM - Speccy emulator for the Pi co-pro
Replies: 113
Views: 3285

Re: SpectROM - Speccy emulator for the Pi co-pro

The VideoNuLA version looks correct to me, apart from a few cut/paste errors in the bottom line.
by hoglet
Tue Jan 23, 2018 10:25 am
Forum: hardware
Topic: SpectROM - Speccy emulator for the Pi co-pro
Replies: 113
Views: 3285

Re: SpectROM - Speccy emulator for the Pi co-pro

Or have I got completely the wrong end of this stick with the need for additional display memory? No - you're spot on. I'm using a 640x256 mode 0 so no tweaking of the 6845 anymore, just VDU 22,0. I'm then filling character rows 0-3 and 28-31 with 0x80. I'm also filling the first and last four char...
by hoglet
Tue Jan 23, 2018 9:49 am
Forum: hardware
Topic: SpectROM - Speccy emulator for the Pi co-pro
Replies: 113
Views: 3285

Re: SpectROM - Speccy emulator for the Pi co-pro

Hi Rob, If you want more details, or can see a simpler way of doing this, just let me know. Can I test my understanding of what you have just said... To get a red border around the screen you would have to do the following: - Set logical colour 0 in the extended palette to Red - Tweak the 6845 to di...
by hoglet
Tue Jan 23, 2018 8:05 am
Forum: upcoming and recent events & exhibitions
Topic: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*
Replies: 143
Views: 6387

Re: ABug NORTH User Group meeting | 19-21 JAN 2018 | MANCHESTER *BOOKING INFO*

Hi Jonathan, Made a start on Atom ROMs The AtomSoftwareArchive has a collection of ROMs here: https://github.com/hoglet67/AtomSoftwareArchive/tree/master/roms The actual files are named with their "Atom" CRC; a C program to generate this is here: https://github.com/hoglet67/AtomSoftwareArc...
by hoglet
Tue Jan 23, 2018 8:01 am
Forum: hardware
Topic: SpectROM - Speccy emulator for the Pi co-pro
Replies: 113
Views: 3285

Re: SpectROM - Speccy emulator for the Pi co-pro

Edit: (I had to check the code for this) and in BASIC, Spectrum to BBC can be done with: attr%=((attr%AND1)*4)+((attr%AND6)DIV2) + ((attr%AND8)*4)+((attr%AND48)DIV2) + (attr%AND&C0) which rotates the INK and PAPER bits of the %FIgrbGRB of the Spectrum attribute byte into %FIbgrBGR. Luckily this...
by hoglet
Sun Jan 21, 2018 7:30 pm
Forum: acorn atom
Topic: Atom Software Archive
Replies: 1151
Views: 87000

Re: Atom Software Archive

Isn't there a "short" Atom MIA list about? These are the current missing commercial titles from my spreadsheet: Aardvark Hedgehog Aardvark Invaders A&F S/W Atomic Cube A&F S/W Escape A&F S/W Pontoon A&F S/W Starburst Atomic S/W 3-Towers Atomic S/W Auto-Number Atomic S/W Bl...
by hoglet
Sun Jan 21, 2018 6:48 pm
Forum: archive submissions
Topic: Atom ROMs
Replies: 3
Views: 105

Re: Atom ROMs

MYSTERY is certainly new to me.

It contains the following commands I think:
START
KILL
RQIN
RCLK
HANGUP
DEFPORT
PORT
TIME
COLOUR
XADC
TIME
PORT
REACT

HANGUP, so maybe a modem ROM?

ONLI also contains those same commands.

Econet 1 and 3 are the same, Econet 2 looks like pin D7 is stuck at 0.

Dave
by hoglet
Sun Jan 21, 2018 6:24 pm
Forum: acorn atom
Topic: Atom Software Archive
Replies: 1151
Views: 87000

Re: Atom Software Archive

Probably worth trawling some of the online databases, and see if they also bring up anything new: http://www.gamesdatabase.org/list.aspx?DM=0&system=acorn_atom and http://www.everygamegoing.com/egg/search/index/?keyword=atom&search_type=machine Edit: Eventually found Forth Utilities listed i...
by hoglet
Sun Jan 21, 2018 6:18 pm
Forum: acorn atom
Topic: Atom Software Archive
Replies: 1151
Views: 87000

Re: Atom Software Archive

was this a MIA, I have this tape for years... :( Well, it was only MIA in the sense that I didn't know it existed, so it never made it into the catalogue, and it's never been included in the archive. It also never made it into any of the Acornsoft catalogues that I have seen. For example, I thought...
by hoglet
Sun Jan 21, 2018 3:29 pm
Forum: acorn atom
Topic: Atom Software Archive
Replies: 1151
Views: 87000

Re: Atom Software Archive

But unfortunately no sign of the program to go with it. Hah, found it! http://www.acornatom.nl/atomarch/acl2-21/ In the cunningly named files: 024, 025, Lets see if it works.... Dave There are some other FORTH programs here: http://www.acornatom.nl/atomarch/acl1-07/ ( TAPE/EDITOR - 1 ) ( TAPE/EDITO...
by hoglet
Sun Jan 21, 2018 3:21 pm
Forum: acorn atom
Topic: Atom Software Archive
Replies: 1151
Views: 87000

Re: Atom Software Archive

I found the Forth Utilities manual is actually on Roland's site:
http://www.acornatom.nl/atom_handleidin ... orth01.htm

But unfortunately no sign of the program to go with it.

Dave
by hoglet
Sun Jan 21, 2018 2:16 pm
Forum: acorn atom
Topic: Atom Software Archive
Replies: 1151
Views: 87000

Re: Atom Software Archive

Hi all, I just stumbled across another MIA title, this time from Acornsoft: Forth Utilities: Forth-Utilities-000.jpg http://www.everygamegoing.com/egg/landingItem/index/machine_type_group_default_folder/acorn_atom/publisher_folder/acornsoft/format_folder/tapes/item_title/Forth-Utilities/ This is dif...
by hoglet
Sun Jan 21, 2018 1:18 pm
Forum: hardware
Topic: SpectROM - Speccy emulator for the Pi co-pro
Replies: 113
Views: 3285

Re: SpectROM - Speccy emulator for the Pi co-pro

Hi Rob, I've now corrected the Speccy attribute implementation in BeebFpga. I wonder if you could possibly run my test program on the real hardware and see if you get the same results as I do. 493.ssd It should look like this: IMG_1187s.JPG All you should need to do is CHAIN "SPECTST" The ...
by hoglet
Sat Jan 20, 2018 10:27 pm
Forum: acorn atom
Topic: Daydreaming: a real VGA display card for the Atom
Replies: 73
Views: 5042

Re: Daydreaming: a real VGA display card for the Atom

If you still have this part in your Pi Copro, could you please test it? Or you could use the attached kernel for the Pi Zero. I do. but it took me a while to remember how it all works This is a very strange bug.. I get it as well, with your kernel, and with the kernel built from the atom_vdu branch...
by hoglet
Sat Jan 20, 2018 8:17 pm
Forum: hardware
Topic: Minimal Tube 6502decode bus snoop with FTDI USB
Replies: 30
Views: 890

Re: Minimal Tube 6502decode bus snoop with FTDI USB

Nice...

Does the register emulation still work correctly?
by hoglet
Sat Jan 20, 2018 7:34 pm
Forum: hardware
Topic: Beeb FPGA
Replies: 486
Views: 29866

Re: Beeb FPGA

RobC wrote:At the moment, I've just replicated what the Spectrum does so there's no translation/manipulation of attribute bytes by the emulator.

Ahh, I've misunderstood then.

I've a bit more work to do....

Dave
by hoglet
Sat Jan 20, 2018 6:19 pm
Forum: hardware
Topic: Beeb FPGA
Replies: 486
Views: 29866

Re: Beeb FPGA

The only missing features are: - programmable left-hand-side blanking - Speccy mode I've had a go at the Speccy mode now. Here's a sample screen I converted coming out of the VideoNuLA in BeebFpga: IMG_1183s.JPG Here's a link to the game: https://spectrumcomputing.co.uk/index.php?cat=96&id=176 ...
by hoglet
Sat Jan 20, 2018 4:47 pm
Forum: for sale / freebies
Topic: AtomMMC 2.0
Replies: 99
Views: 12249

Re: AtomMMC 2.0

jdavis6809 wrote:Any change of a copy of the source so I can try with the oric / atmos

I think these are the more current versions:
- the PIC/AVR code: https://github.com/hoglet67/AtoMMC2Firmware
- the Atom ROM: https://github.com/hoglet67/AtoMMC2

Dave
by hoglet
Sat Jan 20, 2018 1:16 pm
Forum: hardware
Topic: Minimal Tube 6502decode bus snoop with FTDI USB
Replies: 30
Views: 890

Re: Minimal Tube 6502decode bus snoop with FTDI USB

Just to say I'm following this thread with interest, but am otherwise a bit distracted at the moment with a broken central heating system. :-({|= Next week I'll try to make R/W optional in 6502decode. I've just been looking at the code and it is a bit of rework, but I think it should be possible. Cu...
by hoglet
Thu Jan 18, 2018 10:59 pm
Forum: hardware
Topic: Fault finding index
Replies: 86
Views: 17357

Re: Fault finding index

Hoglet, sorry, I need to go back and read that thread, but does you software check reads from memory with "known" values to spot dodgy RAM etc? No, unfortunately it doesn't do this automatically. In this case I did a "diff" against a known good trace, and because the error was e...
by hoglet
Thu Jan 18, 2018 5:44 pm
Forum: hardware
Topic: SpectROM - Speccy emulator for the Pi co-pro
Replies: 113
Views: 3285

Re: SpectROM - Speccy emulator for the Pi co-pro

Rob, Is there any possibility you could save a sample screen of a game running on the emulator? i.e. literally just somehow pause the emulator and save the contents of the screen memory to a file. I'd like to add the Speccy attribute mode to the BeebFpga VideoNuLA implementation, and it would really...
by hoglet
Thu Jan 18, 2018 4:27 pm
Forum: hardware
Topic: Fault finding index
Replies: 86
Views: 17357

Re: Fault finding index

I don't know if this was the one Hoglet was using but he had been experimenting with a logic analyser based on a very cheap piece of hardware to actually sample the signals with the decoding and display done by open source software on the PC including writing a module to trace/disassemble 6502 inst...
by hoglet
Thu Jan 18, 2018 7:37 am
Forum: other vintage computer hardware, software and games
Topic: Reading EPROMS
Replies: 10
Views: 337

Re: Reading EPROMS

Are you planning to use any kind of level shifters?

If not, you could possibly damage the Pi, all of it's GPIO pins work with 3.3V levels.

Dave
by hoglet
Wed Jan 17, 2018 8:42 pm
Forum: acorn atom
Topic: My New Acorn Atom :)
Replies: 63
Views: 1989

Re: My New Acorn Atom :)

Please do post a video of this. It does sound quite strange.
by hoglet
Tue Jan 16, 2018 7:57 am
Forum: emulators
Topic: BeebEm ADFS disc access bug?
Replies: 14
Views: 483

Re: BeebEm ADFS disc access bug?

Can you detail the exact steps to reproduce this error, and also post the disk image you are using?

What version of BeebEm are you using.

It does seem rather weird...
by hoglet
Sun Jan 14, 2018 8:54 pm
Forum: programming
Topic: BeebAsm's Hello World - printing part of file name, not "Hello World"
Replies: 13
Views: 437

Re: BeebAsm's Hello World - printing part of file name, not "Hello World"

occularis wrote:This is probably something painfully simple, but I just can't see it!

Indeed!

This bit doesn't look right:

Code: Select all

    LDX #mytext MOD 256:STA addr
    LDY #mytext DIV 256:STA addr+1

should be:

Code: Select all

    LDA #mytext MOD 256:STA addr
    LDA #mytext DIV 256:STA addr+1

Dave
by hoglet
Sun Jan 14, 2018 7:32 pm
Forum: hardware
Topic: Beeb FPGA
Replies: 486
Views: 29866

Re: Beeb FPGA

Any chance of NuLA support on Beeb FPGA? Coming soon, to a BeebFPGA near you..... :D At the moment it's parked in a branch: https://github.com/hoglet67/BeebFpga/commits/videonula As with Rob's real version, this is essentially a drop-in replacement for the Video ULA component: https://github.com/ho...
by hoglet
Sun Jan 14, 2018 7:56 am
Forum: emulators
Topic: Variations on OSGBPB
Replies: 4
Views: 217

Re: Variations on OSGBPB

There are some better implementation notes on BeebWiki:
http://beebwiki.mdfs.net/OSGBPB

It seems In general the 8-bit systems only implement A=&01 to&08, unless you are running:
- HADFS (&01 to &0B)
- Watford DFS (&01 to &09)

Dave